Highly strong, non-oriented electrical steel sheet and method for manufacture thereof

A non-directional, electromagnetic steel plate technology, applied in the direction of inorganic material magnetism, circuits, magnetic materials, etc., can solve the problems of inability to ensure strength, magnetic properties and steel plate shape, and achieve excellent magnetic properties, excellent fatigue properties, and high-strength steel plate shape and the effect of the magnetic properties

Active Publication Date: 2008-11-19
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] As described above, although some technologies have been disclosed for high-strength non-oriented electrical steel sheets, the current situation is that the required strength,

Method used

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  • Highly strong, non-oriented electrical steel sheet and method for manufacture thereof
  • Highly strong, non-oriented electrical steel sheet and method for manufacture thereof
  • Highly strong, non-oriented electrical steel sheet and method for manufacture thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0154] (Example 1: Invention (1), (2))

[0155] The steel slabs with the composition shown in Table 1 were hot-rolled to a thickness of 2.5 mm, then annealed the hot-rolled sheet at 900° C. and held for 60 s, and then pickled and cold-rolled to a thickness of 0.35 mm.

[0156] Here, the steel G whose Ti content exceeds the range of the present invention often has scaly folding defects after cold rolling, and therefore, no subsequent treatment is performed. In addition, steel N with a Si content as high as 4.3% and almost no Ti and steel P with a Si content exceeding the range of the present invention are not subjected to subsequent treatment because the steel sheet is broken during cold rolling. Next, the final annealing for a soaking time of 20 s was performed under the conditions shown in Table 2. In addition, the tension in the furnace is measured with a tension roller type furnace tension meter in which a load cell is installed in the lower part of the bearing.

[0157] Table ...

Example Embodiment

[0170] (Example 2: Invention (1), (2))

[0171] The slabs of steels A and D in Table 1 were hot-rolled to a thickness of 2.5mm, and then annealed at 800°C for 60s, and then pickled and cold-rolled to a thickness of 0.35mm to produce coils material. The obtained coil material was subjected to final annealing in a continuous annealing furnace under the conditions shown in Table 3, and the same evaluation as in Example 1 was performed.

[0172] The results are shown in Table 3 together. It can be seen from Table 3 that at 650°C, which is a lower annealing temperature, steels A and D have a smaller degree of improvement in the shape of the steel plate even if the furnace tension is higher. On the other hand, the steel sheet shape of the coil material in which the annealing temperature was increased to 800°C and the furnace tension was controlled within the scope of the present invention was significantly improved. By this final annealing, the strength decrease in the conventional stee...

Example Embodiment

[0176] (Example 3: Invention (1), (2))

[0177] The steel slabs of the component composition shown in Table 4 were cold rolled up to the final thickness under any of the following conditions a to c.

[0178] a: After hot rolling to a thickness of 2.0 mm, annealing of the hot rolled sheet is not performed, and warm rolling to a final thickness of 0.35 mm (steel temperature is 250° C.).

[0179] b: After hot-rolling to a plate thickness of 3.8 mm, without performing hot-rolled plate annealing, cold-rolling to 1.5 mm, then performing intermediate annealing at 1000°C for 30 s, and then cold-rolling to a final plate thickness of 0.35 mm.

[0180] c: After hot rolling to a thickness of 2.5mm, after annealing the hot-rolled sheet at 1050°C for 30s, cold rolling to 1.0mm, and then performing intermediate annealing at 1000°C for 30s, then warm rolling to the final thickness of 0.20mm (The steel plate temperature is 200°C).

[0181] Next, the final annealing with a soaking time of 10 s was ...

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Abstract

Disclosed is a non-oriented electrical steel sheet having a high strength, excellent magnetic properties and excellent productivity. The steel sheet comprises 0.010% by mass or less of C and 0.010% by mass or less of N, provided that C + N = 0.010% by mass, and also comprises 1.5 to 5.0% by mass of Si and 0.8% by mass or less of Ti or a mixture of Ti and V, provided that (Ti + V)/(C + N) = 16. The steel sheet may also have a content of a non-recrystallized recovery structure of 50% or more.

Description

technical field [0001] The present invention relates to a high-strength non-oriented electrical steel sheet (high-strength non-oriented electrical steel sheet) and a manufacturing method thereof. The steel sheet of the present invention is particularly suitable for use in electromagnetic parts to which a large stress is applied, typically a rotor of a high-speed rotating machine. Here, examples of the high-speed rotating machine include turbogenerators, drive motors for electric vehicles and hybrid vehicles, robots, servomotors for machine tools, and the like. Background technique [0002] In recent years, due to the development of motor drive systems, the frequency of drive power sources can be controlled, and motors that perform variable-speed operation and motors that rotate at high speeds above a commercial frequency are increasing. In a motor accompanied by such high-speed rotation, the centrifugal force acting on the rotor is proportional to the radius of rotation and...

Claims

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Application Information

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IPC IPC(8): C22C38/00C22C38/14C22C38/60B21B3/02C21D8/12H01F1/16
CPCC21D8/12C22C38/001C22C38/02C22C38/04C22C38/06C22C38/14H01F1/14791H01F1/16
Inventor 河野雅昭尾田善彦大久保智幸
Owner JFE STEEL CORP
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